php - PDO: Assets 和 session 未正确显示

Question

用户登录后，我很难显示用户的信息。

这是我的index.php 文件:

<?php
require 'core/db/connect.php';

    if(isset($_SESSION['username'])){
        include 'includes/menu.php';
    }
    else{
        echo '<a href="register.php">Register</a><br />';
        echo '<a href="login.php">Login</a><br />';
    }
?>

对于 profile.php，每当我回显某些内容时，它不会回显:

<?php 
if(isset($_SESSION['username'])){
    include 'core/db/connect.php';

    $username = $_SESSION['username'];

    $query = dbConnect()->prepare("SELECT username FROM users WHERE username = :username");
    $query->execute(array(':username' => $username));
    $row = $query->fetch();

    echo 'Logged in as: ', $row['username'];
}

?>

这是我的第一个脚本，非常抱歉!

如果这有帮助，这是我的login.php:

<form method="POST">
<input type="text" name="username" placeholder="username"><br/>
<input type="password" name="password" placeholder="password"><br />
<input type="submit">
</form>

<?php
    if(isset($_POST['username'], $_POST['password'])){
    require 'core/db/connect.php';

    $query = dbConnect()->prepare("SELECT username, password FROM users WHERE username = :username AND password = :password");
    $query->execute(array(
        ':username' => $_POST['username'], 
        ':password' => $_POST['password']
    ));

    if($query){
        header('Location: index.php');
    }
    else{
        echo 'Username or Password is wrong.';
    }
}
?>

Answer 1

在 PHP 中使用 session 之前，您必须调用 session_start(); .